add notification channel for home assistant

This adds a notification channel so android users can set uptime kuma specific notification sounds etc...

server/notification-providers/home-assistant.js

@@ -21,6 +21,7 @@ class HomeAssistant extends NotificationProvider {
                     ...(notificationService !== "persistent_notification" && { data: {
                         name: monitor?.name,
                         status: heartbeat?.status,
+                        channel: "uptime-kuma",
                     } }),
                 },
                 {